Emerson 6081-P User Manual

Model 6081-P

Wireless pH/ORP Transmitter

Instruction Manual

PN 51-6081P/rev.A
November 2008

ESSENTIAL INSTRUCTIONS

READ THIS PAGE BEFORE PROCEEDING!

Rosemount Analytical designs, manufactures, and tests its products to meet many national and international
standards. Because these instruments are sophisticated technical products, you must properly install, use, and
maintain them to ensure they continue to operate within their normal specifications. The following instructions
must be adhered to and integrated into your safety program when installing, using, and maintaining Rosemount
Analytical products. Failure to follow the proper instructions may cause any one of the following situations to
occur: Loss of life; personal injury; property damage; damage to this instrument; and warranty invalidation.

• Read all instructions prior to installing, operating, and servicing the product. If this Instruction Manual is not the
correct manual, telephone [phone] and the requested manual will be provided. Save this Instruction
Manual for future reference.

• If you do not understand any of the instructions, contact your Rosemount representative for clarification.

• Follow all warnings, cautions, and instructions marked on and supplied with the product.

• Inform and educate your personnel in the proper installation, operation, and maintenance of the product.

• Install your equipment as specified in the Installation Instructions of the appropriate Instruction Manual and per
applicable local and national codes. Connect all products to the proper electrical and pressure sources.

• To ensure proper performance, use qualified personnel to install, operate, update, program, and maintain the
product.

• When replacement parts are required, ensure that qualified people use replacement parts specified by
Rosemount. Unauthorized parts and procedures can affect the product’s performance and place the safe
operation of your process at risk. Look alike substitutions may result in fire, electrical hazards, or improper
operation.

• Ensure that all equipment doors are closed and protective covers are in place, except when maintenance is
being performed by qualified persons, to prevent electrical shock and personal injury.

NOTICE

The Rosemount Model 6081 and all other wireless devices should be installed only after
the 1420 Wireless Gateway has been installed and is functioning properly. Wireless
devices should also be powered up in order of proximity from the 1420 Wireless
Gateway, beginning with the closest. This will result in a simpler and faster network
installation.

NOTICE

Shipping considerations for wireless products (Power Modules):

The unit was shipped to you without the power module installed. Please remove the
power modules from the unit prior to shipping.

Primary lithium power modules are regulated in transportation by the U. S. Department
of Transportation, and are also covered by IATA (International Air Transport Association),
ICAO (International Civil Aviation Organization), and ARD (European Ground
Transportation of Dangerous Goods). It is the responsibility of the shipper to ensure com­pliance with these or any other local requirements. Please consult current regulations
and requirements before shipping.

The power module with the wireless unit contains two “C” size primary lithium/thionyl chloride power sources.
Each power module contains approximately 5 grams in each pack. Under normal conditions, the power module
materials are self-contained and are not reactive as long as the power modules and the pack integrity are main­tained. Care should be taken to prevent thermal, electrical or mechanical damage. Contacts should be protected
to prevent premature discharge.

Power module hazards remain when cells are discharged.

Power modules should be stored in a clean and dry area. For maximum power module life, storage temperature
should not exceed 30° C.

B

About This Document

This manual contains instructions for installation and operation of the Model 6081-P Wireless pH/ORP
Transmitter. The following list provides notes concerning all revisions of this document.

Rev. Level Date Notes

A 11/08 This is the initial release of the product manual. The manual has been

reformatted to reflect the Emerson documentation style and updated to
reflect any changes in the product offering. This manual contains
information on the HART Smart Model 6081-P.

CAUTION

If a Model 375 Universal Hart® Communicator is
used with these transmitters, the software within the
Model 375 may require modification. If a software
modification is required, please contact your local
Emerson Process Management Service Group or
National Response Center at 1-800-654-7768.

C

QUICK START GUIDE

FOR MODEL 6081 WIRELESS pH TRANSMITTER

D

1. Refer to Section 2.0 Installation for installation instructions.
2 . Wire the pH or ORP sensor to the transmitter. Refer to the sensor instruction sheet for details.

3. Once the connections are secure and verified, install the Power Module to power to the transmitter.

4. When the transmitter is powered up for the first time, Quick Start screens appear. Using Quick Start is easy.
a. A blinking field shows the position of the cursor.
b. Use the ◄ or ► key to move the cursor left or right. Use the▲ or ▼ key to move the cursor up or

down or to increase or decrease the value of a digit. Use the ▲ or ▼ key to move the decimal point.

c. Press ENTER to store a setting. Press EXIT to leave without storing changes. Pressing EXIT also

returns the display to the previous screen.

5. Choose a local language.

6. Choose measurement: pH, ORP, or Redox.

7. Choose preamplifier location. Select Xmtr to use the integral preamplifier in the transmitter.

8. Choose Off or On for displayed diagnostics.

9. Select measurement update rate. Select ENTER to choose an update rate of 1 minute or enter a

value from 1 second to 10 minutes.

10. Choose temperature units: °C or °F

11. Choose Yes to Setup the Wireless Network or No if the Network ID and the Join Key have already been

entered.

12. Enter the 5-digit Wireless Network ID. This ID number must match the Network ID of the Model 1420

Wireless Gateway.

13. Enter the 8-digit Network Join Key number 1 of 4 to match the Model 1420 Wireless Gateway. See the

Note below for clarification.

14. Enter Network Join Key numbers 2, 3, and 4 to match the Model 1420 Wireless Gateway.

15. The transmitter will exit Quick Start and display the live measurement screen.

16. To change the Network ID or Join Key, HART address, or measurement-related settings from the default

values, and to set security codes, press MENU. Select Program and follow the prompts. Refer to the

appropriate menu tree.

17. To return the transmitter to default settings, choose Reset Analyzer in the Program menu.

Note regarding Wireless Device Configuration

In order to communicate with the 1420 Wireless Gateway, and ultimately the Information System, the transmitter
must be configured to communicate with the wireless network. This step is the wireless equivalent of connecting
wires from a transmitter to the information system.

Using a Field Communicator or AMS, enter the Network ID and Join Key so that they match the Network ID and
Join Key of the gateway and other devices in the network. The Network Join Key consists of four (4) blocks,
each with an eight digit code. The code of each block must match its corresponding block in the 1420 in order
for the 6081 to join the network.

If the Network ID and Join Key are not identical, the transmitter will not communicate with the network. The
Network ID and Join Key may be obtained from the 1420 Wireless Gateway on the
Setup>Network>Settings page on the web server.

The final device network configuration piece is the Update Rate. This by default is one (1) minute. This may be
changed at commissioning, or at any time via AMS or the 1420 Wireless Gateway’s web server. The Update
Rate should be between 1 second and 10 minutes.

When device configuration is completed, remove the power module and replace the rear cover of the transmitter
until the time of actual live installation in the process. Tighten the cover to the proper tension for safety
approvals.

E

Quick Start

Menu

English Francais
Espanol >>

Deutsch Italiano
Portuguese >>

Measure? pH
Redox ORP

Use Preamp in?
Xmtr Sensor

Diagnostics?

On Off

Measure update

rate: 1min

Temperature in?
°C °F

Setup Wireless

Network? Yes No

Wireless Network

HART PollAddress

Network ID:

00000

Network Join Key

1 of 4: 00000000

Network Join Key

2 of 4: 00000000

Network Join Key

3 of 4: 00000000

Network Join Key

4 of 4: 00000000

Wireless Network

HART PollAddress

HART Polling

Address: 00

F

FIGURE 1-1. MENU TREE FOR MODEL 6081 pH Wireless TRANSMITTER

MODEL 6081-P pH/ORP TABLE OF CONTENTS

MODEL 6081-P pH/ORP

WIRELESS TRANSMITTER

TABLE OF CONTENTS

Section Title Page

1.0 DESCRIPTION AND SPECIFICATIONS ................................................................ 1

1.1 Features and Applications........................................................................................ 1

1.2 Specifications – General ......................................................................................... 1

1.3 Specifications – Wireless ......................................................................................... 2

1.4 Specifications – Functional ...................................................................................... 2

1.5 Product Certifications............................................................................................... 3

1.6 HART Communications............................................................................................ 3

1.7 Asset Management Solutions ................................................................................. 4

2.0 INSTALLATION ...................................................................................................... 5

2.1 Considerations ......................................................................................................... 5

2.2 Unpacking and Inspection........................................................................................ 5

2.3 Pre-Installation set up .............................................................................................. 6

2.4 Mechanical Installation............................................................................................. 6

2.5 Ground the Transmitter............................................................................................ 6

2.6 Power Module Installation........................................................................................ 10

3.0 WIRING ................................................................................................................... 13

3.1 General Information ................................................................................................. 13

3.2 Sensor Wiring ......................................................................................................... 13

4.0 INTRINSICALLY SAFE INSTALLATION ................................................................ 15

5.0 COMMISSIONING .................................................................................................. 17

5.1 Network Communications ........................................................................................ 17

5.2 Device Network Configuration ................................................................................. 17

5.3 Verify Operation ....................................................................................................... 18

6.0 DISPLAY AND OPERATION ................................................................................. 19

6.1 Display ..................................................................................................................... 19

6.2 Keypad..................................................................................................................... 20

6.3 Menu – pH ............................................................................................................... 20

6.4 Information Screen Messages ................................................................................ 20

6.5 Security ....................................................................................................................21

7.0 OPERATION WITH MODEL 375 ............................................................................ 23

7.1 Note on Model 375 HART Communicator................................................................ 23

7.2 Connecting the HART Communicator...................................................................... 23

7.3 Operation ................................................................................................................. 24

Continued on the following page

i

MODEL 6081-P pH/ORP TABLE OF CONTENTS

TABLE OF CONTENTS CONT’D

ii

8.0 PROGRAMMING THE TRANSMITTER.................................................................. 25

8.1 General .................................................................................................................... 25

8.2 Changing Start-up Settings...................................................................................... 25

8.3 Choosing and Configuring the Analytical Measurement .......................................... 26

8.4 Choosing Temperature Units and Manual or Auto Temperature Compensation...... 28

8.5 Setting a Security Code ........................................................................................... 29

8.6 Making HART-Related Settings ............................................................................... 30

8.7 Resetting Factory Calibration and Factory Default Settings .................................... 30

8.8 Selecting a Default Screen and Screen Contrast .................................................... 31

8.9 Choosing a Display Timeout .................................................................................... 32

9.0 CALIBRATION OF TEMPERATURE ...................................................................... 33

9.1 Introduction .............................................................................................................. 33

9.2 Calibration –Temperature......................................................................................... 33

10.0 CALIBRATION – pH AND ORP ............................................................................. 35

10.1 Introduction .............................................................................................................. 35

10.2 Procedure – Auto Buffer Calibration ........................................................................ 37

10.3 Procedure – Manual Two-Point Buffer Calibration .................................................. 39

10.4 Procedure – Standardization.................................................................................... 40

10.5 Procedure – Entering a Known Slope Value ............................................................ 41

10.6 ORP Calibration ....................................................................................................... 42

11.0 MAINTENANCE ...................................................................................................... 43

11.1 Overview .................................................................................................................. 43

11.2 Transmitter Maintenance ......................................................................................... 43

11.3 pH Sensor Maintenance .......................................................................................... 44

11.4 ORP Sensor Maintenance ....................................................................................... 46

11.5 Calibration................................................................................................................ 46

11.6 Power Module Replacement.................................................................................... 47

12.0 RETURN OF MATERIAL......................................................................................... 49

iii

MODEL 6081-P pH/ORP TABLE OF CONTENTS

LIST OF FIGURES

Number Title Page

2-1 Wall Mounting Insatallation Model 6081................................................................... 8

2-2 Pipe Mounting Insatallation Model 6081 .................................................................. 9

2-3 Removing Rear Cover.............................................................................................. 10

2-4 Power Module Warning Label .................................................................................. 10

2-5 Installing the Power Module ..................................................................................... 10

2-6 Securing the rear cover ............................................................................................ 11

3-1 Model 6081 Sensor Wiring & Connection Points ..................................................... 13

6-1 Displays During Normal Operation........................................................................... 19

6-2 6081 Keypad ............................................................................................................ 20

7-1 Model 6081 Sensor Wiring & Connection Points ..................................................... 23

10-1 Calibration Slope and Offset .................................................................................... 36

11-1 Checking the Potential of the Reference Electrode.................................................. 45

MODEL 6081-P pH/ORP TABLE OF CONTENT

iv

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MODEL 6081-P pH/ORP SECTION 1.0

DESCRIPTION AND SPECIFICATIONS

SECTION 1.0

DESCRIPTION AND SPECIFICATIONS

1

• HIGH ACCURACY AND RELIABILITY for monitoring

applications

• SELF-ORGANIZING NETWORK for high data

reliability and network stability

• INDUSTRY LEADING WIRELESS SECURITY

• COMPATIBLE WITH 1420 WIRELESS GATEWAY

and Emerson Process Management
WirelessHARTTMnetworks

• EASY TO READ two-line display with easy to use

menus

• WirelessHART 7 Digital Communications

• SMART Sensor Enabled

• CONTINUOUS DIAGNOSTICS monitor sensor

performance and health

1.1 FEATURES AND APPLICATIONS

The Model 6081-P transmitter is ideal for monitoring
applications, especially in hard-to-reach or cost­prohibitive locations. Model 6081-P measures pH and
ORP and is compatible with most Rosemount
Analytical pH and ORP sensors. The transmitter has a
rugged, cast aluminum weatherproof and corrosion­resistant enclosure (NEMA 4X). The transmitter includes
a two-line 16-character display with simple and intuitive
menu screens. Plain language prompts in six (6)
local languages guide the user through the pro­gramming and calibration procedures. Model 6081 is
compatible with non-preamp pH and ORP sensors and
SMART pH sensors from Rosemount Analytical.

Installation and start-up of the Model 6081-P wireless
transmitter is simple. Just power the Model 6081-P
and assign it to a wireless network with a Model 1420
Gateway. The unit will auto-locate the most efficient
path to the host and will begin transmitting measurement
data immediately via 2.4 GHz wireless communications.
The Self-Organizing Network ensures exceptional data
reliability and network stability. All of Emerson Process
Management’s wireless devices employ Encryption,
Authentication, Verification, Anti-Jamming and Key
Management to ensure data transmission and security.
Rosemount Analytical devices include intelligent power

management to reduce power consumption and
extend power module life while delivering highly
reliable measurements with rich HART data and diag­nostic information. HART digital communication allows
access to AMS (Asset Management Solutions) for live
process variables, useful diagnostics and
troubleshooting information.

1.2 SPECIFICATIONS - GENERAL

Enclosure: Cast aluminum. NEMA 4X.
Dimensions: 6.55” x 5.40” x 5.15” (166mm x 137mm

x 131mm).

Conduit Openings: 3/4” FNPT
Ambient Temperature: 32 to 122°F (0 to 50°C)
Storage Temperature: -4 to 158°F (-20 to 70°C)
Relative Humidity: 0 to 95% (non-condensing)
Weight/Shipping Weight: 7 lbs/8 lbs (3.2/3.6 kg)
RFI/EMI: EN-61326
Digital Communications: HART 7 WirelessHART

MODEL 6081-P pH/ORP SECTION 1.0

DESCRIPTION AND SPECIFICATIONS

2

1.3 SPECIFICATIONS - WIRELESS

Output: WirelessHART V7
Transmit Rate: User selectable, 1/sec. to 1/60 min

(via 1420 Wireless Gateway or AMS)

Measurement update rate: 1/sec. to 1/10 min
Antenna: PBT/PC integrated omni-directional antenna
Radio Frequency: 2.4 GHz DSSS
Transmission distance - line of sight: about 600 ft

(ideal RF conditions and power module condition)

Power: Lithium thionyl chloride long life power module

1.4 FUNCTIONAL SPECIFICATIONS

pH Range: 0 to 14

ORP Range: -1400 to +1400mV

Compatible with Rosemount Analytical SMART pH sensors

Calibrations/standardization: The automatic buffer

recognition uses stored buffer values and their
temperature curves for the most common buffer
standards available worldwide. The transmitter also
performs a stabilization check on the sensor in
each buffer.

A manual two-point calibration is made by immersing
the sensor in two different buffer solutions and
entering the pH values. The microprocessor auto­matically calculates the slope which is used for
self-diagnostics. An error message will be displayed
if the pH sensor is faulty. This slope can be read on
the display and/or manually adjusted if desired.

An on-line one-point process standardization is
accomplished by entering the pH or ORP value of a
grab sample.

The following calibration methods are supported:

- Two point calibration with Low and High buffer (pH
only)

- Two point calibration with Automatic Buffer

recognition (pH only)

- Single point standardization

- Single point Temperature Adjustment

- Automatic calibration upon live connection to RAI
SMART pH sensors and upload of stored cal data
to transmitter

Automatic Temperature Compensation: External 3-wire

Pt100 RTD or Pt1000 RTD located in the sensor,
compensates the pH reading for temperature
fluctuations. Compensation covers the range -10
to 150°C (14 to 302°F). Manual temperature
compensation is also selectable.

Accuracy: ±1 mV @ 25°C ± 0.01 pH

Repeatability: ±1 mV @ 25°C ± 0.01 pH

Information and Status: Information screens display

faults and warnings, radio transmission status, net­work ID number, Power Module voltage, transmit­ter model, and software version.

Diagnostics: The internal diagnostics can detect:

RTD Failure
Glass Low Failure
Glass High Failure
Broken Glass Fault
Reference High Failure
CPU Error
High Temperature Warning
Low Temperature Warning
Glass Impedance High Warning
Glass Impedance Low Warning
Reference Impedance High Warning
EEPROM Warning
Sense Line Open Warning
Factory Cal Warning
Keyboard Warning

Once a fault or warning is detected, the display will
show a message describing the problem.

Temperature Range: -10 to 150°C (PT100 and

PT1000)

Display: 2-line, 16 character display supports display

of pH and mV units. Display shows temperature.

Approvals:

RFI/EMI: EN-61326

Note regarding ESD: “Change due to disturbance caused by electrostatic discharge will be less than 0.2 pH.”

3

MODEL 6081-P pH/ORP SECTION 1.0

DESCRIPTION AND SPECIFICATIONS

1.5 Product Certifications

Telecommunication Compliance

All wireless devices require certification to ensure that
they adhere to regulations regarding the use of the RF
spectrum. Nearly every country requires this type of
product certification. Emerson is working with govern­mental agencies around the world to supply fully
compliant products and remove the risk of violating
country directives or laws governing wireless device
usage.

FCC and IC

This device complies with Part 15 of the FCC Rules.
Operation is subject to the following conditions: This
device may not cause harmful interference, this device
must accept any interference received, including inter­ference that may cause undesired operation.
This device must be installed to ensure a minimum
antenna separation distance of 20 cm from all persons.

1.6 HART COMMUNICATIONS

1.6.1 OVERVIEW OF HART COMMUNICATION

HART (highway addressable remote transducer) V.7 supports a wireless digital communication system.

The HART protocol, originally developed by Fisher-Rosemount, is now overseen by the independent HART
Communication Foundation. The Foundation ensures that all HART devices can communicate with one another.
For more information about HART communications, call the HART Communication Foundation at [phone].
The internet address is http://www.hartcomm.org.

1.6.2 HART INTERFACE DEVICES

HART communicators allow the user to view measurement data (pH, ORP and temperature), program the transmit­ter, and download information from the transmitter for transfer to a computer for analysis. Downloaded information
can also be sent to another HART transmitter. Either a hand-held communicator, such as the Rosemount Model 375,
or a computer can be used. HART interface devices operate fromthe HART taps inside the rear enclosure.

If your communicator does not recognize the Model 6081 pH/ORP transmitter, the device description library may
need updating. Call the manufacturer of your HART communication device for updates.

MODEL 6081-P pH/ORP SECTION 1.0

DESCRIPTION AND SPECIFICATIONS

1.7 ASSET MANAGEMENT SOLUTIONS

Asset Management Solutions (AMS) is software that helps plant personnel better monitor the performance of ana­lytical instruments, pressure and temperature transmitters, and control valves. Continuous monitoring means
maintenance personnel can anticipate equipment failures and plan preventative measures before costly break­down maintenance is required.

AMS uses remote monitoring. The operator, sitting at a computer, can view measurement data, change program
settings, read diagnostic and warning messages, and retrieve historical data from any HART-compatible device,
including the Model 6081-P transmitter. Although AMS allows access to the basic functions of any HART compat­ible device, Rosemount Analytical has developed additional software for that allows access to all features of the
Model 6081-P transmitter.

AMS can play a central role in plant quality assurance and quality control. Using AMS Audit Trail, plant operators
can track calibration frequency and results as well as warnings and diagnostic messages. The information is
available to Audit Trail whether calibrations were done using the infrared remote controller, the Model 375 HART
communicator, or AMS software.

AMS operates in Windows 95. AMS communicates through a HART-compatible modem with any HART
transmitters, including those from other manufacturers. AMS is also compatible with FOUNDATION™
Fieldbus, which allows future upgrades to Fieldbus instruments.

Rosemount Analytical AMS windows provide access to all transmitter measurement and configuration variables.
The user can read raw data, final data, and program settings and can reconfigure the transmitter from anywhere
in the plant.

4

MODEL 6081-P pH/ORP SECTION 2.0

INSTALLATION

SECTION 2.0

INSTALLATION

2.1 Considerations

2.2 Unpacking and Inspection

2.3 Pre-Installation Set Up

2.4 Mechanical Installation

2.5 Ground the Transmitter

2.6 Power Module Installation

2.1 CONSIDERATIONS

The transmitter can be commissioned before or after installation. It may be useful to commission it on the bench, before
installation, to ensure proper operation and to become familiar with its functionality. When applicable, make sure the instru­ments are installed in accordance with intrinsically safe or non-incendive field wiring practices. The device will be powered
whenever the power module is installed. To avoid depleting the power module, make sure it is removed when the device
is not in use.

Power module

The Model 6081 is battery powered. The power module with the wireless unit contains 2 “C” size primary
lithium/thionyl chloride batteries. Each power module contains approximately .5 grams of lithium. Under normal
conditions, the power module materials are self-contained and are not reactive as long as the power module
integrity is maintained. Care should be taken to prevent thermal, electrical or mechanical damage. Contacts
should be protected to prevent premature discharge. Use caution when handling the power module. The power
module may be damaged if dropped from heights in excess of 20 feet.

Sensor

Make sensor connections through the cable entry in the enclosure. Be sure to provide adequate clearance
for cover removal.

Environmental

Verify that the operating atmosphere of the transmitter is consistent with the appropriate hazardous locations
certifications.

2.2 UNPACKING AND INSPECTION

Inspect the shipping container. If it is damaged, contact the shipper immediately for instructions. Save the box. If
there is no apparent damage, remove the transmitter. Be sure all items shown on the packing list are present. If
items are missing, immediately notify Rosemount Analytical.

Save the shipping container and packaging. They can be reused if it is later necessary to return the transmitter to the
factory.

5

6

2.3 PRE-INSTALLATION SETUP

2.3.1 Temperature Element

The Model 6081-P pH/ORP transmitter is compatible with sensors having Pt 100 and Pt 1000. Sensors from other
manufacturers may have a Pt 1000 RTD. For Rosemount Analytical sensors, the type of temperature element in
the sensor is printed on the tag attached to the sensor cable. For the majority of sensors manufactured by
Rosemount Analytical, the RTD IN lead is red and the RTD RTN lead is white. The Model 328A sensor has no
RTD. The Model 320HP system has a readily identifiable separate temperature element. Resistance at room
temperature for common RTDs is given in the table.

If the resistance is... the temperature element is a
about 110 ohms Pt 100 RTD
about 1100 ohms Pt 1000 RTD

2.3.2 Reference Electrode Impedance

The standard silver-silver chloride reference electrode used in most industrial and laboratory pH electrodes is low
impedance. EVERY pH and ORP sensor manufactured by Rosemount Analytical has a low impedance reference.
Certain specialized applications require a high impedance reference electrode. The transmitter must be
re-programmed to recognize the high impedance reference.

2.3.3 Preamplifier Location

pH sensors produce a high impedance voltage signal that must be preamplified before use. The signal can be
preamplified before it reaches the transmitter or it can be preamplified in the transmitter. To work properly, the
transmitter must know where preamplification occurs. Although ORP sensors produce a low impedance signal, the
voltage from an ORP sensor is amplified the same way as a pH signal.

If the sensor is wired to the transmitter through a junction box, the preamplifier is ALWAYS in either the junction
box or the sensor. Junction boxes can be attached to the sensor or installed some distance away. If the junction
box is not attached to the sensor, it is called a remote junction box. In most junction boxes used with the Model
6081-P pH/ORP, a flat, black plastic box attached to the same circuit board as the terminal strips houses the pre­amplifier. The preamplifier housing in the 381+ sensor is crescent shaped.

If the sensor is wired directly to the transmitter, the preamplifier can be in the sensor or in the transmitter. If the
sensor cable has a GREEN wire, the preamplifier is in the sensor. If there is no green wire, the sensor cable will
contain a coaxial cable. A coaxial cable is an insulated wire surrounded by a braided metal shield. Depending on
the sensor model, the coaxial cable terminates in either a BNC connector or in a separate ORANGE wire and
CLEAR shield.

2.4 Mechanical Installation

When choosing an installation location and position, take into account the need for access to the transmitter. For
best performance, the antenna should be vertical with some space between objects in a parallel metal plane such
as a pipe or metal framework, as the pipes or framework may adversely affect the performance of the antenna.

2.5 Ground the Transmitter

The electronics enclosure should be grounded in accordance with local and national installation codes. This can
be accomplished via the process connection, via the internal case grounding terminal, or via the external ground­ing terminal.

mV and RTD Inputs

Each process installation has different requirements for grounding. Use the grounding options recommended by
the facility for the specific sensor type, or begin with grounding Option 1 (the most common).

MODEL 6081-P pH/ORP SECTION 2.0

INSTALLATION

7

WARNING

Failure to follow these installation guidelines could result in death or serious injury.

• Make sure only qualified personnel perform the installation.

Explosions could result in death or serious injury.

• Before connecting a 375 Field Communicator in an explosive atmosphere, make
sure the instruments are installed in accordance with intrinsically safe or
non-incendive field wiring practices.

• Verify that the operating atmosphere of the transmitter is consistent with the
appropriate hazardous locations certifications.
Process leaks could result in death or serious injury.
Electrical shock could cause death or serious injury.

• Use extreme caution when making contact with the leads and terminals.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
conditions: This device may not cause harmful interference, this device must accept any
interference received, including interference that may cause undesired operation.
This device must be installed to ensure a minimum antenna separation distance of 20 cm
from all persons.

MODEL 6081-P pH/ORP SECTION 2.0

INSTALLATION

NOTE:

Always use facility recommended wiring practices.

8

MODEL 6081-P pH/ORP SECTION 2.0

INSTALLATION

2.4.2 Mounting on a Flat Surface.

Figure 2-1. Wall Mounting Installation Model 6081. Use Pipe/Wall Mounting Bracket Kit, PN 23820-00
Note: PN 23820-00 mounting bracket kit includes mounting hardware for pipe mounting only. Wall mounting
hardware to be provided by customer. Only use suitable fasteners and hardware to securely fasten the bracket
and transmitter to the wall surface.

9

MODEL 6081-P pH/ORP SECTION 2.0

INSTALLATION

2.4.3 Pipe Mounting.

The pipe mounting kit (PN 23820-00/01) accommodates 1-1/2 to 2 in. pipe.

Figure 2-2. Pipe Mounting Installation Model 6081. Use Pipe/Wall Mounting Bracket Kit, PN 23820-00